What type of AM layer construction method involves creating an entire layer at once?

The method that involves creating an entire layer at once is known as 3D stacking. In this process, multiple layers are built simultaneously rather than sequentially. This technique is particularly advantageous in additive manufacturing (AM) as it allows for quicker production of complex structures, significantly reducing the overall time compared to building single layers one at a time.

3D stacking facilitates the integration of different materials and functionalities within a single layer, enabling innovative designs, especially in applications such as electronics and medical devices. This method is also associated with advanced techniques that can enhance thermal and electrical properties, further expanding its use in the manufacturing industry.

In contrast, slicing refers to the process of converting a 3D model into a series of 2D cross-sections that are built layer by layer, making it a sequential operation. Layer fusion typically refers to the bonding of layers that have been laid down, rather than the method of constructing an entire layer at once. The term "2D channel" does not accurately apply to constructing layers in 3D printing. Therefore, the correct choice appropriately fits the definition of creating an entire layer at once.